Thanks.
You can find big tanks quite cheap on petlink.com.au
You could probably get away with a year to a year and a half - 2years. Thats if you get him small. Sooties are notorious for being a bully and when they get bigger they can kill everything in your tank, but that depends on the fish.
Bullrouts are easy to keep, they dont move much unless you piss them off, then they move real quick. You have to watch them though when cleaning your tank and performing other maintenance, they are poisonous and if you get stung, they hurt like buggery and you will need to go to hospital. They are an ambush predator, I hand feed mine, they only eat live food, but I have heard of people getting them onto prawn or pellets.